<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div>
  <input type="text" v-model="n1">
  <input type="text" v-model="n2">
  <input type="button" value="加" @click="f('+')">
  <input type="button" value="减" @click="f('-')">
  <input type="button" value="乘" @click="f('*')">
  <input type="button" value="除" @click="f('/')">
  <h3>结果：{{result}}</h3>
</div>
<script src="js/vue.min.js"></script>
<script>
  let v=new Vue({
    el:"body>div",
    data:{
      n1:"",n2:"",result:""
    },
    methods: {
        f(x) {
            /*eval()方法可以将字符串已js代码的形式运行，将运行结果返回*/
            v.result = eval(v.n1 + x + v.n2)
        }
    }
  })
</script>
</body>
</html>